William McElwee Miller (December 12, 1892 – July 7, 1993) was an American missionary to Persia, and author of several books.
During his missionary work in Persia, he also encountered followers of the Baháʼí Faith, a large religious minority there.
Much of his ministerial work involved developing Christian apologetic responses to these religions.
With respect to the Baháʼí Faith, his Baha'ism, Its Origin, History and Teachings,[2] published in 1931, was the first of two books, and several apologetic and polemical articles on the subject.
In 1974, a new follow-up, The Baha'i Faith: Its History and Teachings[4] added additional material not available previously, made available to the author by a known opponent of the Bahá'í Faith.